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the solution:
6
4
5
3
7
1
8
2
9
7
2
1
8
9
6
4
5
3
8
3
9
2
5
4
1
7
6
5
8
2
9
3
7
6
4
1
4
1
7
6
8
5
3
9
2
9
6
3
1
4
2
5
8
7
2
9
8
4
6
3
7
1
5
1
5
6
7
2
8
9
3
4
3
7
4
5
1
9
2
6
8